<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="" />
      </div>
      <!-- 表单区域 -->
      <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" class="login_form">
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input v-model="loginForm.username" prefix-icon="el-icon-user" auto-complete=""></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input v-model="loginForm.password" type="password" prefix-icon="el-icon-s-goods">123</el-input>
        </el-form-item>
        <!-- 按钮区域 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登陆</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>

    <div></div>
  </div>
</template>

<script>
export default {
  data () {
    return {
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      // 表单验证规则对象
      loginFormRules: {
        // 验证用户名是否合法
        username: [
          { required: true, message: '请输入登陆名称', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        // 验证密码是否合法
        password: [
          { required: true, message: '请输入登陆密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
        ]
      }
    };
  },
  methods: {
    // 点击重置按钮，重制登陆表单
    resetLoginForm () {
      this.$refs.loginFormRef.resetFields();
    },
    // 预验证
    login () {
      this.$refs.loginFormRef.validate(async valid => {
        console.log(valid);
        if (!valid) return;
        const { data: res } = await this.$http.post('login', this.loginForm);
        if (res.meta.status !== 200) return this.$message.error('登陆失败！');
        this.$message.success('登陆成功');
        // 将登陆成功之后的token，保存到客户端的sessionStorage中
        // 项目中除了登陆之外的其他API接口，必须在登陆之后才能访问
        // token只应在当前网站打开期间生效，所以将token保存在sessionStorage中
        window.sessionStorage.setItem('token', res.data.token);
        // 通过编程式导航跳转到后台主页，路由地址是 /home
        this.$router.push('/home');
      });
    }
  }
};
</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
.login_container {
  background: #2b4b6b;
  height: 100%;
}
.login_box {
  width: 450px;
  height: 300px;
  background: #fff;
  border-radius: 3px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}
.avatar_box {
  position: absolute;
  height: 130px;
  width: 130px;
  border: 1px solid #eee;
  border-radius: 50%;
  overflow: hidden;
  padding: 10px;
  box-shadow: 0 0 10px #ddd;
  left: 50%;
  transform: translate(-50%, -50%);
  background-color: #fff;
}
.avatar_box img {
  height: 100%;
  width: 100%;
  border-radius: 50%;
  background-color: #eee;
}
.btns {
  display: flex;
  justify-content: flex-end;
}
.login_form {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 20px;
  box-sizing: border-box;
}
</style>
